Abstract: An ultrasonic wave transmission medium supply/discharge member includes a balloon for an ultrasonic endoscope that is mounted to cover an outer surface of an ultrasound transducer provided in a distal end part body on a distal end side of an insertion portion of an ultrasonic endoscope, in which the balloon for an ultrasonic endoscope has a storage portion that is configured to be filled with an ultrasonic wave transmission medium, a tube that communicates with an inside of the storage portion, and a fixing portion that is configured to be attachably and detachably fixed to an operating portion of the ultrasonic endoscope and that is connected to the balloon for an ultrasonic endoscope through the tube.

Abstract: An ultrasonic endoscope includes: a distal end part body provided on a distal end side of an insertion part; and an ultrasound transducer provided on a distal end side of the distal end part body, in which an outer peripheral surface of the distal end part body is improved to increase a contact region of a proximal end part of the ultrasound transducer with a patient's body wall surface, so that it is possible to reliably perform visualization of an ultrasound image in the proximal end part.

Abstract: An ultrasonic endoscope (1) including a distal end body block component (260) in which an ultrasound transducer (50), an observation optical system (40), and an illumination optical system (44) are mounted, and a channel block component (70) in which a channel into which a treatment tool is inserted is mounted, in which the ultrasonic endoscope (1) has a first load receiving structure (110) in which the channel block component (70) receives a load from the distal end body block component (260), and a second load receiving structure (120) in which the distal end body block component (260) receives a load from the channel block component (70).

Abstract: An ultrasonic endoscope includes an ultrasound transducer, a distal end body block component in which an observation optical system and an illumination optical system are mounted, a channel block component, and a flexible printed circuit part that is disposed inside the distal end body block component and is connected to the ultrasound transducer, the flexible printed circuit part includes a transducer connection portion, an offset wiring portion that is positioned on an opposite side to the transducer connection portion and is disposed in an offset manner at a position away from a longitudinal axis toward an outside in a radial direction of the longitudinal axis with respect to the transducer connection portion, and an intermediate connection portion that connects the transducer connection portion and the offset wiring portion, the offset wiring portion has a cable bonding portion to which loose cables are bonded, and the cable bonding portion is covered with an insulating member that is positioned inside th

Abstract: Provided is a balloon for an ultrasonic endoscope in which an ultrasound oscillator surface of an ultrasound transducer can be most swollen. A balloon for an ultrasonic endoscope that is mounted to cover an outside surface of an ultrasound transducer provided in a distal end part body on a distal end side of an insertion part includes a bottomed tubular balloon body that has an opening portion provided at one end in a first direction corresponding to a longitudinal direction of the insertion part and attached to the distal end part body, covers an oscillator surface of the ultrasound transducer, and stores an ultrasonic wave transmission medium inside, to be swellable, and a swelling restricting part that, in a case where the ultrasonic wave transmission medium is stored inside the balloon body, makes an oscillator surface region facing the oscillator surface of the ultrasound transducer most swollen by restricting a part of the balloon body.

Abstract: An ultrasonic endoscope system has an ultrasonic endoscope including an ultrasound transducer provided in a distal end part body, and a balloon for an ultrasonic endoscope that covers an outside surface of the ultrasound transducer, the balloon for an ultrasonic endoscope has an opening portion that is provided at one end in a first direction corresponding to a longitudinal direction of an insertion part and that is attached to the distal end part body, and includes a swelling portion that stores an ultrasonic wave transmission medium inside to be swellable, and a fixing portion that is in close contact with and fixed to the distal end part body, the distal end part body includes standing wall portions on both sides of the ultrasound transducer in a direction perpendicular to the first direction, and at least the fixing portion is in close contact with and fixed to the standing wall portion by contractile force of the fixing portion.

Abstract: Provided is a balloon for an ultrasonic endoscope capable of securing fluid-tightness of a storage portion that stores an ultrasonic wave transmission medium. A balloon for an ultrasonic endoscope that is mounted to cover an outside surface of an ultrasound transducer provided in a distal end part body on a distal end side of an insertion part has a balloon body that covers an oscillator surface of the ultrasound transducer, the balloon body has at least a two-layer structure including an inner part, and an outer part that covers the inner part, the inner part has an opening portion that is provided at one end in a first direction corresponding to a longitudinal direction of the insertion part and that is attached to the distal end part body, the outer part is bonded to the inner part on an opening portion side of the inner part, and a storage portion that stores an ultrasonic wave transmission medium is provided between the inner part and the outer part.

Abstract: The endoscope is provided with the forceps elevator which is erectably provided in the distal end part of the insertion part of the endoscope and guides a treatment tool led out from the distal end part. The forceps elevator has an erecting motion range from a minimum angular position to a maximum angular position. If a state in which the treatment tool is not led out from the distal end part is assumed, the erecting operation lever for operating the movement of the forceps elevator has: a first operation range where the erecting operation lever is operated within the erecting motion range of the forceps elevator; and a second operation range where the erecting operation lever is operated beyond the first operation range. When the erecting operation lever is operated into the second operation range, the locking mechanism locks the movement of the erecting operation lever.

Abstract: The endoscope is provided with the forceps elevator which is erectably provided in the distal end part of the insertion part of the endoscope and guides a treatment tool led out from the distal end part. The forceps elevator has an erecting motion range from a minimum angular position to a maximum angular position. If a state in which the treatment tool is not led out from the distal end part is assumed, the erecting operation lever for operating the movement of the forceps elevator has: a first operation range where the erecting operation lever is operated within the erecting motion range of the forceps elevator; and a second operation range where the erecting operation lever is operated beyond the first operation range. When the erecting operation lever is operated into the second operation range, the locking mechanism locks the movement of the erecting operation lever.